package chapter05.E8;

public class e8 {
    public static void main(String[] args) {
        System.out.println("1 添加--------");
        add();
        System.out.println("2 删除--------");
        remove();
        System.out.println("3 修改--------");
        alter();
    }

    public static void add(){
        StringBuffer sb = new StringBuffer();
        sb.append("itcast");
        System.out.println(sb);
        sb.insert(2,"123");
        System.out.println(sb);
    }
    public static  void remove(){
        StringBuffer sb = new StringBuffer("itcastcn");
        sb.delete(1,5);
        System.out.println(sb);
        sb.deleteCharAt(2);
        System.out.println("sb =" +sb);
        sb.delete(0,sb.length());
        System.out.println("sb = " + sb);
    }
    public static void alter(){
        StringBuffer sb = new StringBuffer("itcastcn");
        sb.setCharAt(1,'9');
        System.out.println("sb = " +sb);
        sb.replace(1,3,"qwer");
        System.out.println("sb = " +sb);
        System.out.println(sb.reverse());
    }
}
